Non-local properties of a symmetric two-qubit system
Quantum Physics
2007-05-23 v2
Abstract
Non-local properties of symmetric two-qubit states are quantified in terms of a complete set of entanglement invariants. We prove that negative values of some of the invariants are signatures of quantum entanglement. This leads us to identify sufficient conditions for non-separability in terms of entanglement invariants. Non-local properties of two-qubit states extracted from (i) Dicke state (ii) state generated by one-axis twisting Hamiltonian, and (iii) one-dimensional Ising chain with nearest neighbour interaction are analyzed in terms of the invariants characterizing them.
Keywords
Cite
@article{arxiv.quant-ph/0509015,
title = {Non-local properties of a symmetric two-qubit system},
author = {A. R. Usha Devi and M. S. Uma and R. Prabhu and Sudha},
journal= {arXiv preprint arXiv:quant-ph/0509015},
year = {2007}
}
Comments
5 pages, no figures